The present disclosure generally relates to methods of operating storage devices. The storage device comprises a controller comprising first random access memory (RAM1), second random access memory (RAM2), and a storage unit divided into a plurality of streams. When a write command is received to write data to a stream, change log data is generated and stored in the RAM1, the previous delta data for the stream is copied from the RAM2 to the RAM1 to be updated with the change log data, and the updated delta data is copied to the RAM2. The delta data stored in the RAM2 is copied to the storage unit periodically. The controller tracks which delta data has been copied to the RAM2 and to the storage unit. During a power failure, the delta data and the change log data are copied from the RAM1 or the RAM2 to the storage unit.
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2. The storage device of claim 1, wherein the controller is further configured to copy the updated delta data from the first volatile memory unit to a parking section in the non-volatile storage unit.
3. The storage device of claim 1, wherein the predetermined amount of time is 20 seconds.
4. The storage device of claim 1, wherein each section of the one or more sections is copied to the non-volatile storage once per minute.
5. The storage device of claim 1, further comprising one or more energy storage devices configured to provide power to the controller, wherein the controller is further configured to use the power provided by the one or more energy storage devices to copy the one or more sections of the plurality of ranks of the first volatile memory unit to the non-volatile storage unit responsive to experiencing a power failure event.
7. The storage device of claim 1, wherein the first volatile memory unit is dynamic random-access memory (DRAM) or magnetoresistive random-access memory (MRAM).
9. The storage device of claim 8, wherein the controller is further configured to update delta data for a particular stream each time a command is received to write data to the particular stream.
11. The storage device of claim 8, wherein the controller is further configured to copy the updated delta data from the first volatile memory unit to a parking section in the non-volatile storage unit.
13. The storage device of claim 8, further comprising one or more energy storage devices configured to provide power to the controller, wherein the controller is further configured to use the power provided by the one or more energy storage devices to copy the one or more sections of the plurality of ranks of the first volatile memory unit to the non-volatile storage unit responsive to experiencing a power failure event.
17. The storage device of claim 15, wherein each section of the one or more sections is configured to store data for 1 stream to 5 streams.
18. The storage device of claim 15, wherein each section of the one or more sections is configured to comprise 1 rank to 10 ranks.
19. The storage device of claim 15, further comprising one or more energy storage devices configured to provide power to the controller, wherein the controller is further configured to use the power provided by the one or more energy storage devices to copy the one or more sections of the plurality of ranks of the first volatile memory means to the non-volatile storage unit responsive to experiencing a power failure event.
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May 26, 2020
January 24, 2023
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